You have to watch these real close especially in the area of the sight, but the only one I can see that didn't rupture was the Blaser.

Now hasn't Blaser been taking a bunch of heat for doing just this---Rupturing? You can see it's fore end bounce but doesn't appear to rupture..

I'm a bit skeptical about these tests anybody know the source. What lab would hang a sheet of white paper up behind a work bench then clamp the barrel in a bench vise to do scientific test of a barrel.

Still very interesting